/*
    This file is part of Sylvan.
    Copyright (C) 2008-2018 Cute Chess authors
    Copyright (C) 2019 Wilbert Lee

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with Sylvan.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "pgntoken.h"

PgnToken::PgnToken()
    : m_begin(-1),
      m_end(-1)
{
}

PgnToken::~PgnToken()
{
}

bool PgnToken::isEmpty() const
{
    return toString().isEmpty();
}

int PgnToken::length() const
{
    return m_end - m_begin;
}

void PgnToken::insert(QTextCursor& cursor)
{
    if (isEmpty())
        return;

    if (!cursor.hasSelection())
        m_begin = cursor.position();
    else
        m_begin = cursor.selectionStart();

    vInsert(cursor);
    m_end = cursor.position();
}

void PgnToken::select(QTextCursor& cursor)
{
    if (m_begin == -1 || m_end == -1)
        return;

    cursor.setPosition(m_begin);
    cursor.setPosition(m_end, QTextCursor::KeepAnchor);
}

void PgnToken::move(int diff)
{
    if (m_begin == -1 || m_end == -1)
        return;

    m_begin += diff;
    m_end += diff;
}

void PgnToken::mergeCharFormat(QTextCursor& cursor, const QTextCharFormat& format)
{
    cursor.setPosition(m_begin);
    cursor.setPosition(m_end - 1, QTextCursor::KeepAnchor);
    cursor.mergeCharFormat(format);
}
